.mi_wrapper{
    width: 1226px;
    margin:0 auto;
}

/* 清除元素浮动，解决float高度塌陷问题 */
.clear_fix::after{
    content: "";
    display: block;
    clear: both;

    height: 0;
    visibility: hidden;
}

.wrapper_01{
    width: 1100px;
    margin: 0 auto;
}
.wrapper_02{
    width: 980px;
    margin: 0 auto;
}